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Reward Candy Dispenser for Personal Computers
A personal computer peripheral, battery powered reward candy dispenser which immediately presents students with a single candy for each problem completed correctly.
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| Number | Title | Issue Date |
| 7270315 | Exchange column, perforated tray assembly In, for example, a gas-liquid, liquid/liquid exchange column, perforated tray assemblies are provided which have a plurality of adjacent tray sections with slots adjacent rounded leading edges of the sections, and catches extending along trailing edges which interlo... | 09/18/2007 |
